SAMPLE QUESTION PAPER CHEMISTRY (043) CLASS XII (2013-14) Design of Question paper Time: 3 hrs. Maximum Marks:70 A. Weightage to different forms of questions S. No. Type of question Marks per Question Total number of Questions Total marks 1 VSA 1 8 8 2 SA I 2 10 20 3 SA II/Value Based Question 3 9 27 4 LA 5 3 15 Total 30 70 B. Typology of Questions S. No. Typology Weightage in marks Weightage in percentage 1 Knowledge Based 14 20% 2 Conceptual Understanding 21 30% 3 Inferential Type 14 20% 4 Reasoning Based 11 15% 5 Skill Based 10 15% Total 70 100%
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SAMPLE QUESTION PAPER
CHEMISTRY (043)
CLASS XII (2013-14)
Design of Question paper
Time: 3 hrs. Maximum Marks:70
A. Weightage to different forms of questions
S. No. Type of question
Marks per Question
Total number of Questions
Total marks
1 VSA 1 8 8
2 SA I 2 10 20
3 SA II/Value Based
Question
3 9 27
4 LA 5 3 15
Total 30 70
B. Typology of Questions
S. No.
Typology Weightage in marks
Weightage in percentage
1 Knowledge Based 14 20%
2
Conceptual Understanding
21 30%
3 Inferential Type 14 20%
4 Reasoning Based 11 15%
5 Skill Based 10 15%
Total 70 100%
C. Scheme of options
There will be no overall choice. However, internal choice in any one question of two marks, any one question of three marks and all the three questions of five marks weightage has been provided.
- Value Based Questions may be asked from any unit / chapter / topic. - It will carry 3-5 marks.
SAMPLE QUESTION PAPER CHEMISTRY (043)
CLASS-XII – (2013-14)
Time Allotted: 3 Hrs Maximum Marks: 70
General Instructions:
1. All questions are compulsory.
2. Question No. 1-8 are very short answer questions and carry 1 mark each.
3. Question No. 9-18 are short answer questions and carry 2 marks each.
4. Question No. 19-27 are also short answer questions and carry 3 marks each.
5. Question No. 28-30 are long answer questions and carry 5 marks each.
6. Use log tables if necessary, use of calculators is not allowed. Q.1 Bond enthalpy of fluorine is lower than that of chlorine, why?
Q.2 Give the IUPAC name of the following compound:
(CH3)3-C-C-COOH
║ O
Q.3 On increasing temperature, activation energy of a reaction decreases, why?
Q 4 Which of the following is most effective electrolyte in the coagulative of AgI/Ag+sol?
K2SO4, MgCl2, K4[Fe(CN)6]
Q.5 Write the reaction when glucose is heated with excess of HI.
Q.6 Which Xe compound has distorted octahedral shape?
Q.7 What is the denticity of co-ordination compound used for the treatment of lead Poisoning?
Q.8 An alkoxide is a stronger base than hydroxide ion. Justify.
Q.9 (a) State the law which helps to determine the limiting molar conductivity of weak
electrolyte.
(b) Calculate limiting molar conductivity of CaSO4 (limiting molar conductivity of
calcium and sulphate ions are 119.0 and160.0 S cm2mol
-1 respectively).
Q.10 Rate constant K for first order reaction has been found to be 2.54 x 10-3
sec-1
. Calculate its three-fourth life.
OR
A first order gas reaction A2(g)B2(g) → 2A(g) + 2B(g) at the temperature 4000C has the rate
Constant K =2.0x10-4
sec-1
. What percentage of A2B2 is decomposed on heating for 900
seconds.
Q.11 Do the following conversions:
(i) Methyl bromide to acetone.
(ii) Benzyl chloride to 2-phenyl acetic acid.
Q.12 How will you distinguish between the following pairs of compounds:
(i) Chloroform and carbon tetra chloride. (ii) Benzyl alcohol and chlorobenzene.
Q.13 For a chemical reaction variation in rate with conc. is shown below:
Rate
Conc.—→
What is the order of the reaction?
What are the units of rate constant K for the reaction?
Q.14 Give the electronic configuration of d-orbitals of K3 [Fe(CN6)] and K3 [FeF6] and
explain why these complexes give different colour with same solution.
(At. No. Of Fe=26u)
Q.15 Give reason for the following:
(i) O-Toludine is more basic than aniline. (ii) Tertiary amines do not undergo acetylation reaction.
Q.16 Write the following name reaction:
(i) Gabriel phthalimide reaction. (ii) Hoffman bromamide reaction.
Q.17 Silver metal crystallises with a face centred cubic lattice. The length of unit cell is
found to be 4.077x10 -8
cm. Calculate atomic radius and density of silver.
(atomic mass of Ag = 108u, NA = 6.02x1023
mol-1
)
Q.18 Calculate packing efficiency in ccp structure.
Q.19 Manu and his father went to a shop to purchase a battery for their inverter. Shopkeeper showed them two types of batteries, one with lead plates and the other with cadmium plates. The battery with cadmium plates was more expensive than the lead battery. They decided to purchase lead battery as it was cheaper.
After reading the above passage, answer the following questions:
a) As a student of chemistry, why would you suggest to Manu and his father to buy the expensive cadmium plate battery. Give two reasons.
b) Which two values will you be promoting through your suggestions?
Q.20 Give a reason for the following:
(i) Rough surface of catalyst is more effective than smooth surface. (ii) Smoke passed through charged plates before allowing it to come out
of chimneys in factories. (iii) Ne gets easily absorbed over charcoal than He.
Q.21 (a) Give one example of each of the following:
(i) Acidic flux (ii) Basic flux
(b) What happens when:
(i) Cu2O undergoes self reduction in a silica line
converter. (ii) Haematite oxidises carbon to carbon monoxide.
OR
(a) What role does cryolite play in Hall Haraoult process? (b) How can alumina be separated from silica in a bauxite ore associated
with silica? Give equations also.
Q.22 Write balanced chemical equations for the following reactions.
(a) Hypophosphorous acid is added to AgNO3 solution. (b) Chlorine gas is passed through hot and concentrated solution of sodium
hydroxide.
(c) XeF2 undergoes hydrolysis.
Q.23 (i) Draw the structure of sulphuric acid. (ii) A sparkless current is passed through oxygen to prepare ozone. why? (iii) Bleaching action of sulphur is a temporary action .Comment.
Q.24 (i) Give one structural difference between amylose and amylopectin
(ii) Name the protein and its shape present in oxygen carrier in human body.
(iii) Name two fat storing tissues in human body.
Q.25 Define the following by giving one example of each:
(i) Antiseptics
(ii) Antioxidants
(iii) Narcotic analgesics
Q.26 (a) Write the names of the monomers of polymer used for making
unbreakable crockery. . (b) write the reaction of preparation of neoprene. (c) Arrange the following polymers in decreasing order of intermolecular
forces.
PVC, Nylon 66, Natural rubber.
Q.27 Write the mechanism for preparation of ethanol from ethene.
Q.28 (a) What is the freezing point of 0.4 molal solution of acetic acid in
benzene in which it dimerises to the extent of 85%. Freezing point of
benzene is 278.4k and its molar heat of fusion is 10.042kj mol-1
.
(b) Explain the following:
(i) Solution of chloroform and acetone is an example of maximum boiling azeotrope.
(ii) A doctor advised a person suffering from high blood pressure to take less quantity of common salt.
OR
(a) Calculate the boiling point of a solution containing 0.61g of benzoic
acid in 5 g of CS2 .Assuming 84% dimerisation of acid. The boiling
point and Kb of CS2 are 46.2 0C and 2.3 K Kg mol
-1 respectively.
(b) State Raoult's law for the solution containing non-volatile solute. Give
its mathematical expression also.
Q.29 Account for the following :
(i) Transition elements show highest oxidation state in their oxides than fluorides.
(ii) Cu has positive electrode potential in the first transition series.
(iii) Ionisation enthalpy of lanthanides is higher than actinides. (iv) Potassium dichromate is a good oxidising agent in acidic medium.
(v) Actinides show more number of oxidation states than lanthanides.
OR
(a) Compare non transition and transition elements on the basis of their
(i) Variability of oxidation states (ii) stability of oxidation states.
(b) Give chemical reactions for the following observations:
(i) Potassium permanganate is a good oxidising agent in basic
medium.
(ii) Inter convertibility of chromate ion and dichromate ion in aqueous solution depends Upon pH of the solution.
(iii) Potassium permanganate is thermally unstable at 513K.
Q.30. (a) Give names of the reagents to bring about the following transformations:
i) Ethanoic acid to ethanol
ii) Propane-1-ol to propanal iii) Pent-3-en-2-ol to pent-3-en-2-one
iv) Sodium benzoate to benzene
(b) Arrange the following in the uncreasing order of: